Giannini

Son of Gianichi, from the Vongola Specialized Family that focuses Engineering. Weapon Tuning, Modification and Creation is no problem for this Gianninis family they have been supplying Vongola with specialized weapons. Giannini gets really fired up when it comes to his work, and really loves working on rare items. He is said to have the same traits in his work like his father

Source: http://reborn.wikia.com/wiki/Giannini